Burglarproof picture frame



Nov. l5, 1927. 1,648,978

W. ZIERENBERG BURGLARPROOF PICTURE FRAME Filed Feb. 25, 1927 Y refr/ofi-Mneua: "7

Patented Nov. 15, 1927.

UNITED STATES PATENTA OFFICE.

BURGLARPROOF PICTURE FRAME.

Application filed February 25, 1927, Serial No. 170,852, and in GermanyMarch 2, 1926.

v This invention relates to improved means tor guarding pictures,particularly such of high value, against their being' cut out of theirframes by burglars, and it consists in placing directly behind thepicture cloth a layer resisting to the action oit cutting tools andpreventing a smooth and rectilinear cutting, said layer consisting .ofcorrugated hard sheet-metal, of which the co-rrugations are ob-liquelydirected.

In most cases, it sulices to arrange said layer of a certain breadth atthe back of the picture along the rear stretching frame of the picturecloth, where the pictures are genera-lly cut out oi their frames byburglars.

It is'known that the cutting work by burglars must be quickly doneduring the short absence or" the attendants in a museum or the like, andthis quick work is quite impossible with the layer placed behind thepicture, while furthermore a smooth and rectilinear cutting required formaintaining the value of the cut-out picture is also made impossible.The improved guard can be easily provided on any existing pictureswithout high costs, and it is not visible from outside.

The accompanying drawing illustrates by way oi example how the inventioncan be put into practice: Fig. l is a front view of a picture in itsframe, while Fig. 2 is a section on the line A-B of Fig. l.

Directly behind the picture cloth a a layer b of corrugated sheet-metal,preferably zinc,

is placed along the rear stretching frame 0 `f tools while preventing asmooth and rectilinear cutting, said layer consisting of corrugated hardsheet-metal of which the corrugations are obliquely directed.

In testimony whereof I have hereunto set my hand.

WILHELM ZIERENBERG`

